Let $F(x)=e^{x}$, $G(x)=e^{-x}$ and $H(x)=G(F(x))$, where $x$ is a real variable. Then, $\frac{dH}{dx}$ at $x=0$ is

  • A
    $1$
  • B
    $-1$
  • C
    $-\frac{1}{e}$
  • D
    $-e$

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